Code Generation/Exercise 9: Difference between revisions

Latest revision as of 18:15, 6 December 2018

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-== The Original Code ==
+#REDIRECT [[ist:Code Generation/Exercise 9]]
-Consider the following C code:
-<c>
-static unsigned long a = 10;
-static double *v;
-extern void *malloc(unsigned long);
-static double *mkvec(unsigned long n) {
-  if (n < 1) return (double *)0;
-  unsigned long s = sizeof(double);
-  double *v = (double *)malloc(n * s);
-  return v;
-}
-double *compute() {
-  v = mkvec(a * 4);
-  for (unsigned long i = 1; i < a; i++)
-    if (v[i] > v[0]) v[i] = 3 * i - 1;
-  return v;
-}
-</c>
-Assume that the size of pointers, '''int''', and '''unsigned long''' is 32 bits and that the size of '''double''' is 64 bits.
-== Postfix Code ==
-The Postfix code for the above code is as follows:
-<asm>
-</asm>
-== Compiling and Running ==
-To compile the Postfix code directly, [[pf2asm]] can be used:
-* pf2asm traverse.pf
-* yasm -felf traverse.asm
-[[category:Compilers]]
-[[category:Teaching]]